The diagnostic potential of low-field MRI in problematic total knee arthroplasties - a feasibility study

Schröder, Femke F.; Post, Corine E.; van Raak, Sjoerd M.; Simonis, Frank F. J.; Wagenaar, Frank-Christiaan B. M.; Huis in’t Veld, Rianne M. H. A.; Verdonschot, Nico

doi:10.1186/s40634-020-00274-2

Journal of Experimental Orthopaedics

Table 1 Clinical diagnosis with additional imaging results + low-field MRI observations + findings during surgery per patient

From: The diagnostic potential of low-field MRI in problematic total knee arthroplasties - a feasibility study

	*Clinical work-up*				*Clinical diagnosis*	*Low-field MRI*	*Findings during surgery*	*Agreement*
Patient	Anamnesis	Conventionalradiographs	CT	Other				D & MRI	OR & MRI	CT & MRI
1	Instability anddiffuse pain	Negative	Negative	Varus & valgus stress films, positive	Collateral laxity	Negative	Collateral laxity	–	–	++
2	Pain anterolateral and swelling	Negative	9⁰ internal rotation of the tibial component	Varus & valgus stress films, positive	Collateral laxity, no clinical malposition	11⁰ internal tibial component rotation	Collateral laxity	–	–	++
3	Instability and pain anterolateral	Negative	4⁰ internal rotation of the femoral component	Valgus stress films,positive	Malalignment of the femoral component	3⁰ internal rotation of the femoral component	Malalignment of the femoral component	++	++	++
4	Pain anterolateral, medial and swelling	Negative	6⁰ internal rotation of the tibial component	Varus & valgus stress films, positive	Malalignment and asymmetric laxity	5⁰ internal tibial component rotation	Malalignment of the tibial component	++	++	++
5	Anteriorknee pain	Tibial component loosening	Lucency around tibial component suspected for loosening	Negative punction and lab	Tibial component loosening	Effusion around the medial side of the tibial component and the MCL	Partial tibial component loosening.	+	+	+
6	Medial knee pain	Tibial component loosening	Lucency around tibial stem suspected for loosening	Negative punction and lab	Tibial component loosening	Effusion around the tibial stem	n/a	+	n/a	+
7	Diffuse painand swelling	Negative	Lucency around the tibial component. Possible early loosening	Not applicable	Early tibial component loosening	Joint effusion	n/a	+	n/a	+
8	Pain anterolateral and during stair climbing	Negative	n/a	Bone scintigraphy showing patellofemoral activity	Patellofemoral arthroses	Patellofemoral arthroses	Patellofemoral arthroses	++	++	n/a

D = diagnosis, OR = findings during surgery, ++ excellent agreement, + moderate agreement, −- no agreement, n/a. not applicable

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